Foot and Ankle Flashcards
Tibial external rotation with DF in closed chain resulting in injury with pain at the distal tibia and fibular is associated with what type of injury?
- syndesmotic injury; high ankle sprain
closed chain eversion injury with pain on the medial ankle/foot is associated with what type of injury?
- eversion injury; medial ankle sprain
What is a large difference with care/precautions following a syndesmotic injury (high ankle sprain) compared to a medial or lateral ankle sprain?
- more conservative WB to allow for healing of the syndesmosis
What are the two subgroups/categories/phases conceptually for the CPG for lateral ankle sprains?
- Acute/protected motion phase
- Progressive loading/sensorimotor training phase
What are the characteristics of the acute/protected motion phase?
Significant edema or pain
w/in ~ 72 hours of injury
limited weight bearing
evidence of overt gait deviations
What are the characteristics of the progressive loading/sensorimotor training phase?
Primary concerns of functional instability
Generally more chronic presentation
What are the two primary ligaments affected by a lateral ankle sprain, and which order are they affected in?
- ATFL first, then CFL
What is the standard mechanism of injury for a lateral ankle sprain?
o Ankle/foot in plantar flexed position, followed by hypersupination at forefoot/midfoot
Other than the ATFL and CFL, what structures can be affected by a lateral ankle sprain? (7)
- posterior TFL
- anterior deltoid ligament
- lateral subtalar ligament
- peroneal retinaculum
- extensor retinaculum
- peroneal tendons
- superficial peroneal nerve
What are the main differential dx in the acute phase of lateral ankle sprain? (6)
Fractures Muscle strains Cuboid syndrome Syndesmosis Subtalar joint sprain Adjacent joint sprains
What are the main differential dx in the post-acute phase of lateral ankle sprain? (6)
…there are a lot more than 6…but these are the first 6 that showed up in the slide
Chronic (functional) ankle instability Accessory ossicles Tarsal coalition Impingement (anterolateral or posterior) Osteochondral lesions Sinus Tarsi Syndrome
What are the Ottawa Ankle Rules for a lateral ankle sprain?
Imaging needed if:
- unable to bear weight for more than 4 steps immediately after the injury or in the ED
- pain with palpation of:
• Malleolar zone or midfoot zone
• Posterior edge or tip of either malleolus
• Navicular
• Styloid px of 5th metatarsal
Functional risk factors for lateral ankle sprain are generally related to what two things?
- general movement habits
- ability to correct in the face of a hypersupination load
What 4 functional risk factors for lateral ankle sprain have level I evidence support?
- abnormal gait mechanics
- impaired postural stability
- impaired proprioception
- impaired NM reaction time
What 3 functional risk factors for lateral ankle sprain have Level II evidence support?
- low aerobic fitness
- deficits in cutaneous sensation
- deficits in nerve conduction velocity
What 2 functional risk factors for lateral ankle sprain have Level IV evidence support?
- low ankle eversion strength
- impaired balance test performance
What 2 structural risk factors for lateral ankle sprain have Level I support?
- foot and ankle morphology
- specific ankle laxity (increased talar supination; talar tilt)
What 6 structural risk factors for lateral ankle sprain have Level II support?
- limited ankle complex ROM
- other morphological characteristics
- general joint laxity
- limb dominance
- Female gender
- specific ankle complex laxity
What 5 extrinsic risk factors for lateral ankle sprain have Level I support?
- Poor environmental conditions/playing surface
- Court or team-based activity or sport
- Use of ankle tape and or/brace (reduce)
- Use of foot orthoses (reduce)
- Warm up including stretching (reduce)
What 5 extrinsic risk factors for lateral ankle sprain have Level II support?
- Level of competition or intensity
- Patient sex; effect on severity of injury
- Preventative efforts and patient education (reduce)
- Appropriate shoe type to playing conditions (reduce)
- Slower self-selected running speed
What are 5 outcome measures that are appropriate during eval to assess function for lateral ankle sprain?
- Foot and Ankle Ability Measure (FAAM)
- LEFS
- Ankle Joint Functional Assessment Tool (AJFAT)
- Chronic Ankle Instability Scale (CAIS)
- Sports Ankle Rating Scale (SARS)
What are 3 appropriate outcome measures designed to identify or grade severity with functional ankle instability? (FAI)
Which ones ID, vs grade severity, or both?
- Ankle Instability Instrument: ID and grade severity
- Cumberland Ankle Instability Tool: grade severity
- Functional Ankle Instability Questionnaire: ID
What are the 6 characteristics of a Grade I lateral ankle sprain?
- No loss of function
- No ligamentous laxity
- Little or no hemorrhage
- No point tenderness
- Decreased total ankle motion of 5 degrees or less
- Swelling of 0.5 cm or less
What are the 6 characteristics of a Grade II lateral ankle sprain?
- Some loss of function
- Positive anterior drawer test (ATFL involvement)
- Negative talar tilt test (no CFL involvement)
- Hemorrhaging
- Point tenderness
- Decreased total ankle motion > than 5* but < 10*
- Swelling > 0.5 cm but < 2.0 cm